I have a Circon UHC-300 Controller at a medical office that regularly loses its application and configuration.

I always happens near 8:30 PM, but not always on the same night. It happens once or twice per week. I have visited the site near the time when this happens, but never witnessed it actually happen.

I have replaced the controller, eliminating that option. I also added a UPS between the 120 and control transformer. There are no other controllers on the system, just this one. There is a VFD drive tied to the controller via LON, and a LON remote space sensor, both of these devices work just fine.

I am trying to find a way to identify what could be causing the controller to lose the configuration.

Any suggestions?

Thanks,

-Mike

11-12-2012, 09:45 AM

381engineer

That is a strange one.

since you have removed it, I'd suggest setting it up on a bench and hook up some relays and a temp sensor to it and let it run and see if it dumps the config. If it does then you know the issue is in the controller and if it doesn't then you might expect it to happen again on the new one.

I'd definitely see if you could set up up some trends on the power supply.

11-12-2012, 10:25 AM

AtticusFinch

Greetings Mike,

What is the status of the battery?

11-12-2012, 10:40 AM

ac-inc

381engineer: The controller has been replaced, and the issue persists. I did some testing on the controller that I took out, and was not able to reproduce the problem. Being such a small site, there is no front-end, making trending difficult. If by the end of the week I have no other options, I am thinking of installing a Wattnode and trending.

AtticusFinch: The 3 volt battery is holding its charge just fine. This was the also the case with the controller that I took out.

An additional note, this site has been running fine for many years, and this issue just started about 3 months ago.

The facility is located near a large shopping mall. It was thought that perhaps around 8:30 (when the problem happens) that a large load is taken offline for the mall (maybe lights or a few large chillers for example), causing a voltage spike in the power line that could not be regulated fast enough. This was the thought behind adding a UPS to the control transformer.

Thanks,

-Mike

04-10-2013, 11:11 AM

MatthewCharters

Did you ever resolve this? I have a campus that has 2 locations that need to get reloaded, one about every 3 days, the other about every three months. We have replaced them, changed batteries, transformers, etc. Next we try some shamanism. The contractor that has our service contract has no answers, just shrugged shoulders. Thanks for any input.

A UPS was added, but it did not resolve the issue. It is still somewhat unresolved, however a few weeks ago I noticed the trend logs were filling up with irregular dates and times. It would log a number of valid points for a few days, but always went haywire at the same point. The irregular entries were always consistent as well. I disabled logging on the controller and it no longer lost its application. We are currently logging with an iLon until the issue is resolved. As I previously stated, this was happening with any controller we used, so it was not a faulty device.

I reported this information to Circon and will update this post when I get an explanation from them.